Benzyl adenine is more effective than potassium silicate on decreasing the detrimental effects of heat stress in pepper (Capsicum annum cv. PS301)

Document Type: Full Article


Department of Horticulture, College of Agriculture, Isfahan University of Technology, Isfahan, I. R. Iran


ABSTRACT- Heat stress causes flower and fruit abscission in pepper. This study was conducted in the greenhouses of Isfahan University of Technology to evaluate the effect of foliar application of Benzyl adenine (BA) and potassium silicate (K2SiO3) under heat stress condition on bell pepper. Two factorial experiments based on completely randomized design with four concentrations of BA (0, 0.06, 0.6 and 6 ppm) and the second with two levels of K2SiO3 (0 and 5 Mm) both in two temperature treatments (25±2 (optimum) 35±2  (high temperature)) with six replicates were conducted. The results of the study indicated that the use of BA (especially 6 ppm) promoted growth parameters and increased proline, phenol and antioxidant content. Also, application of BA 6 ppm improved cell membrane stability assessed via decreasing electrolyte leakage (EL) and also reduced flower abscission in bell pepper. BA at 6 ppm increased plant height, shoot and root dry weight, proline and total phenol, root fresh weight, potassium (K) concentration and decreased flower abscission. Antioxidant content increased with heat stress in all BA levels. Results of the study indicated that fresh and dry weight of root and K concentration increased with 5 mM K2SiO3. Moreover, root fresh weight and K concentration and antioxidant content increased in 5 mM K2SiO3 under heat stress.


Main Subjects

Article Title [Persian]

بنزیل آدنین نسبت به سیلیکات پتاسیم در کاهش اثرات مضرتنش گرما بر فلفل موثرتر است

Authors [Persian]

  • مرجان طاهری
  • مریم حقیقی
گروه باغبانی، دانشکده کشاورزی، دانشگاه صنعتی اصفهان، اصفهان، ج. ا. ایران
Abstract [Persian]

چکیده- تنش گرما موجب ریزش گل و میوه در فلفل می­گردد. این پژوهش در گلخانه­های دانشگاه صنعتی اصفهان به منظور ارزیابی تاثیر کاربرد برگی بنزیل آدنین (BA) و سیلیکات پتاسیم (K2SiO3) تحت شرایط تنش گرما بر فلفل دلمه­ای انجام شد. دو آزمایش فاکتوریل بر اساس طرح کاملا تصادفی با چهار غلظت BA (0، 06/0، 6/0و 6 پی پی ام) و دومین بار با دو سطح K2SiO3(0 و 5 میلی­مولار) در دو تیمار دمایی( اپتیمم (2±25) و دمای بالا (2±35)) با شش تکرار انجام شد. نتایج پژوهش نشان داد که استفاده BA (بخصوص غلظت 6 پی­پی­ام) فاکتورهای رشد را بهبود می­بخشد، پرولین، میزان فنول و محتوای آنتی­اکسیدان را افزایش می­دهد. همچنین کاربرد BA با غلظت 6 پی­پی­ام  پایداری غشا سلولی را بهبود می­بخشد یا نشت یونی را در فلفل دلمه­ای را کاهش می­دهد و همچنین ریزش گل را کاهش می­دهد. بنابراین کاربرد BA اثرمنفی تنش گرما را کاهش می­دهد. BA با غلظت 6 پی­پی­ام، ارتفاع گیاه و ریزش گل را بهبود می­بخشد، کاهش وزن تر و خشک شاخساره و ریشه، پرولین و فنول کل را کاهش می­دهد. وزن تر ریشه و غلظت پتاسیم را افزایش و ریزش گل را کاهش می­دهد. محتوای آنتی­اکسیدان با تنش گرما در همه سطوح BA  افزایش می­یابد. نتایج پژوهش نشان می­دهد که وزن تر و خشک ریشه و غلظت پتاسیم با غلظت سیلیکات پتاسیم 5 میلی­مولار افزایش می­یابد. همچنین، در غلظت 5 میلی­مولار سیلیکات پتاسیم ، وزن تر ریشه و غلظت پتاسیم بهبود و محتوای آنتی­اکسیدان تحت تنش گرما افزایش می­یابد.

Keywords [Persian]

  • محتوای آنتی‌اکسیدان
  • پرولین
  • فنول
  • ریزش گل
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